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- W159493804 abstract "Evolutionary changes in the diversity and bathymetric deployment of major benthic invertebrate groups, both those that produce and those that modify bioclasts, suggest that the nature of shell accumulations is likely to have also changed through the Phanerozoic. Specifically, it has been suggested that, excepting crinoidal deposits, the Paleozoic-Triassic record is dominated by thin shell concentrations ( 1 m). To test this, the authors focused on siliciclastic records in two end-point periods. Using the literature on North America and Europe combined with extensive field-checking, they found that brachiopod-, trilobite-, and bryozoan-dominated accumulations in the Ord-Sil are typically thin but that there are important exceptions. In the Tertiary, thick concentrations are composed of a much larger variety of groups, occur in a wider range of environments, and exhibit a greater diversity of biostratinomic features and inferred accumulation histories. Information on the paleobathymetry, paleolatitude and tectonic setting was evaluated for all data points, and so the contrasting patterns of shell accumulation can clearly be related to differences in geologic age rather than to environmental biases in data collection. Even the analysis of only a few shell-bed features, therefore, provides strongmore » evidence for long-term changes in the nature of the bioclastic fossil record. Work still in progress suggests that there are also long-term changes in the distribution and nature of bioclastic deposits through stratigraphic (3rd-order) sequences, particularly in the character of skeletal material associated with key surfaces.« less" @default.
- W159493804 created "2016-06-24" @default.
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- W159493804 date "1993-04-01" @default.
- W159493804 modified "2023-09-24" @default.
- W159493804 title "Phanerozoic trends in shell accumulations: A comparison of Ordovician-Silurian and Tertiary records" @default.
- W159493804 hasPublicationYear "1993" @default.
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